Hook



FIG. 1 is a front view showing the new design for a hook;

FIG. 2 is a perspective view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a left side view thereof, the right side being a mirror image thereof; and,

FIG. 6 is a rear view thereof. 

The ornamental design for a hook, as shown and described. 